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The world's biggest hamburger chain is set to expand its test of chicken wings to Chicago this week, after a successful run in Atlanta last year.

The wings are being sold in servings of three, five or 10 pieces with prices starting at $3.

A spokeswoman for McDonald's confirmed the test in Chicago would start this week at about 500 restaurants but said there weren't any plans yet to bring the wings to other cities. She noted that no new sauces were being offered with the wings and that the creamy ranch sauce would be the default dipping sauce.